The topic of this thesis is firm behavior and how it is shaped by institutional changes and firms’ recruitment decisions. The first essay studies how the recruitment decisions made by small and medium-sized enterprises (SMEs) affect their subsequent productivity development. Previous studies have shown that being able to recruit employees with complementary skills is associated with skill improvement among incumbent personnel, suggesting that new recruits promote productivity through knowledge spillovers. Using matched employer-employee data, we find that recruiting personnel from large multinational firms can be instrumental for the performance of SMEs. In the second essay, we evaluate the labor market effects of the 2007 Swedish youth pay...